a google app script UiApp, that tracks clicks on a button in a spreadsheet.

track.js

function doGet() {
  var app = UiApp.createApplication();

  var button = app.createButton('Click Me');
  app.add(button);

  var label = app.createLabel('The button was clicked.')
    .setId('statusLabel')
    .setVisible(false);
  app.add(label);

  var handler = app.createServerHandler('myClickHandler');
  handler.addCallbackElement(label);
  button.addClickHandler(handler);

  return app;
}

function myClickHandler(e) {
  var app = UiApp.getActiveApplication();

  var label = app.getElementById('statusLabel');
  label.setVisible(true);

  var ss = SpreadsheetApp.openById('0Ak4WxzRx93UYdHZwSXJDQ3dJblB4WU52M2VFd2R3NFE');
  var sheet = ss.getSheets()[0];
  sheet.getRange(sheet.getLastRow()+1, 1, 1, 2).setValues([[new Date(), 1]]); 

  app.close();
  return app;
}